An international team of astronomers has performed photometric and spectroscopic observations of a binary star system known as ASASSN-18aan and have found that the object is an unusual cataclysmic variable with a relatively long orbital period. The findings were presented February 9 on the arXiv pre-print server.
source https://phys.org/news/2021-02-asassn-18aan-unusual-cataclysmic-variable.html
